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Please use this identifier to cite or link to this item: http://repository.iitr.ac.in/handle/123456789/12714
Title: Effect of carbon coating on electrochemical performance of LiFePO4 cathode material for Li-ion battery
Authors: Raj H.
Sil A.
Published in: Ionics
Abstract: Pristine LiFePO4 (LFP) and carbon-coated LiFePO4 (LFP/C) are synthesized by sol-gel process using citric acid as a carbon precursor. LFP/C is prepared with three different stoichiometric ratios of metal ions and citric acid, namely 1:0.5, 1:1, and 1:2. Prepared LFP and LFP/C powder samples are characterized by X-ray diffractometer, field emission scanning electron microscope, transmission electron microscope, and Raman spectrophotometer. Electrochemical performances of pristine and carbon-coated LFP are investigated by charge-discharge and cyclic voltammetry technique. The results show that LFP/C (1:1) with an optimum thickness of 4.2 nm and higher graphitic carbon coating has the highest discharge capacity of 148.2 mA h g−1 at 0.1 C rate and 113.1 mA h g−1 at a high rate of 5 C among all four samples prepared. The sample LFP/C (1:1) shows 96% capacity retention after 300 cycles at 1 C rate. The decrease in discharge capacity (141.4and 105.9 mA h g−1 at 0.1 and 5 C, respectively) is observed for the sample LFP/C (1:2). Whereas, pristine LFP shows the lowest discharge capacity of 111.1 mA h g−1 at 0.1 C and capacity was decreased very fast and work only up to 147 cycles. Moreover, cyclic voltammetry has also revealed the lowest polarization of 0.19 V for LFP/C (1:1) and the highest 0.4 V for pristine LFP. © 2018, Springer-Verlag GmbH Germany, part of Springer Nature.
Citation: Ionics (2018), 24(9): 2543-2553
URI: https://doi.org/10.1007/s11581-017-2423-0
http://repository.iitr.ac.in/handle/123456789/12714
Issue Date: 2018
Publisher: Institute for Ionics
Keywords: Carbon coating
Electrochemical performance
Li-ion battery
LiFePO4
Sol-gel process
ISSN: 9477047
Author Scopus IDs: 57190811180
7003754102
Author Affiliations: Raj, H., Department of Metallurgical and Materials Engineering, Indian Institute of Technology Roorkee, Roorkee, Uttarakhand 247667, India
Sil, A., Department of Metallurgical and Materials Engineering, Indian Institute of Technology Roorkee, Roorkee, Uttarakhand 247667, India
Funding Details: Acknowledgements The authors acknowledge Council of Scientific and Industrial Research (CSIR), Government of India (Grant No. 03/1318/14/ EMR-II) for its financial support. The authors would also like to acknowledge Dr. Soumya Shankar Ghosh (Postdoctoral Fellow in our department) for his technical support and suitable discussion.
Corresponding Author: Sil, A.; Department of Metallurgical and Materials Engineering, Indian Institute of Technology RoorkeeIndia; email: asil1fmt@iitr.ac.in
Appears in Collections:Journal Publications [MT]

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